EP0678351B1 - Procédé de fabrication d'une poulie à gorges multiples, outil de formage mis en oeuvre par ce procédé et poulie ainsi obtenue - Google Patents

Procédé de fabrication d'une poulie à gorges multiples, outil de formage mis en oeuvre par ce procédé et poulie ainsi obtenue Download PDF

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Publication number
EP0678351B1
EP0678351B1 EP19950400617 EP95400617A EP0678351B1 EP 0678351 B1 EP0678351 B1 EP 0678351B1 EP 19950400617 EP19950400617 EP 19950400617 EP 95400617 A EP95400617 A EP 95400617A EP 0678351 B1 EP0678351 B1 EP 0678351B1
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EP
European Patent Office
Prior art keywords
rim
axis
punch
symmetry
pulley
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19950400617
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German (de)
English (en)
French (fr)
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EP0678351A1 (fr
Inventor
Gérard Magniez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SOCIETE FINANCIERE D'ETUDE ET DE DEVELOPPEMENT IND
Original Assignee
FINANCIERE D'ETUDE ET DE DEVELOPPEMENT INDUSTRIEL ET TECHNOLOGIQUE - SOFEDIT Ste
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Publication of EP0678351A1 publication Critical patent/EP0678351A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/261—Making other particular articles wheels or the like pulleys

Definitions

  • the present invention relates to a tool for mounting on a press and intended for forming a pulley blank, according to the preamble of claim 1 (see for example FR-A-1,583,264), said pulley comprising a flange on which a cylindrical rim of revolution is connected around of an axis of symmetry.
  • the invention also relates to a process of manufacturing using this tool and the pulley thus obtained.
  • Multi-grooved pulleys are used in belt transmission of motor vehicles, for example for rotate the crankshaft and the alternator, and they are advantageously equipped with a vibration damping device, constituted for example by a lead inertia crown coupled to the pulley through a thickness of elastomeric material.
  • Multi-grooved pulleys were made by casting or by machining a sintered metal part.
  • the pulleys thus produced have the disadvantage of being heavy, because the fragility of the materials used must be compensated by a significant thickness of material, in particular at level of the rim on which the grooves are formed and subjected to forces important.
  • the present invention provides a new manufacturing process, allowing to obtain from a pulley blank, by the implementation a special tool to be mounted on a press, a pulley that is both light and reduced dimensions.
  • the present invention also relates to the special tool used works by this process.
  • the publication US-A-5 129 146 describes a tool and a method using a blank whose thickness has necessarily been previously locally increased in the rim region.
  • the tool according to the invention is defined in claim 1.
  • the tool according to the invention allows to make a pulley blank having a thickened rim, of constant and sufficient thickness for the formation by flow turning of grooves without the need to make a loop as mentioned above, and thus reduce, by the absence of a loop, the size of the pulley.
  • the bottom of the matrix is guided in sliding along said axis of symmetry between an end of travel position where it comes in abutment against a support integral with a movable part of the press, and a position of start of race in which it is recalled by first return means and in which it abuts against a shoulder of the matrix, the latter being slidably mounted along said axis of symmetry between an end position in which it comes to a stop against said support, and a start position in which it is recalled by second recall means.
  • the punch is guided in sliding along the axis of symmetry between an end position in which it rests against a sole integral with a fixed part of the press, and a start position of racing in which it is recalled by third means of recall and in which it abuts against a shoulder of a retaining part fixed on the sole.
  • the punch is slidably mounted on a symmetrical guide pin of revolution around said axis of symmetry, and the bottom of the die has a bore capable of receiving this pin of guidance during press operation.
  • a method using the tool according to the invention is defined in claim 8.
  • the present invention also relates to a pulley obtained according to the process according to the invention with the features set out in claim 10.
  • the method and the tool according to the invention make it possible to manufacture from a thin sheet stamped pulleys without loop, light.
  • the rim of the pulley is strong enough that after the formation of the grooves we can forcibly insert into the pulley in contact with the radially inner surface of the rim a vibration damping device, consisting of a ring on the radially inner periphery of which adheres, by means of a layer of viscoelastic material, a crown of inertia.
  • Publication JP-A-1 058 864 describes a grooved pulley multiple including a symmetrical rim of revolution and a flange, said pulley being internally provided with a device vibration damper.
  • the invention thus makes it possible to produce such a sheet metal pulley, the rim connecting perpendicularly to the flange and having, at the connection, an external surface generally at right angles, the thickness of the rim having been increased, by axial compaction of the rim, so that the device vibration damper is force-fitted into the rim.
  • a tool 1 according to an embodiment of the invention, comprising a lower part 2 to be mounted in a manner known per se on a fixed table of a single-acting press (known in itself and not shown) and an upper part 3 to be fixed under a movable part, called slide, of the press (also known in itself and not shown), suitable for being controlled vertically by approaching or moving away from the table.
  • a single-acting press known in itself and not shown
  • slide movable part, of the press
  • the lower part 2 of the tool 1 has a fixing sole 90 having a flat and horizontal bottom surface 91, intended for rest on the press table.
  • the fixing sole 90 is provided on its upper surface 92, flat and parallel to lower surface 91, of a retaining plate 120 whose role will be explained below.
  • a punch 10, the upper front face of which bears the reference 14, is slidably mounted in a counterbore 121 of the retaining part 120.
  • the punch 10 is bored in its center at 15 for the passage of a pin guide 100 anchored below in the sole 90 and projecting at its upper end above the upper front face 14.
  • a P pulley blank coming from stamping is attached to the front face upper 14, as will be explained below.
  • This draft pulley P has a hub M threaded on spindle 100 and extended radially outwards by a flange F and a cylindrical rim J of revolution around an axis of symmetry X, connecting to one side of the flange F.
  • the punch 10 has a radially outer 11 cylindrical surface of revolution around the X axis, at the base of which protrudes a flange 17 axially retained in the counterbore 121.
  • the punch 10 is mounted to slide along the X axis on the spindle guide 100 between a start of travel position, shown in the Figure 4A, in which the flange 17 abuts by a shoulder 12 in the bottom 13 of the counterbore 121 and an end of travel position, shown in FIG. 1, in which the lower front face 18 of the punch 10 rests against the upper surface 92 of the sole 90.
  • the punch 10 is normally recalled, when tool 1 is at rest, in its start position of racing by return means constituted in the exemplary embodiment described by six springs 80 with axes parallel to the X axis, equally distributed angularly around it.
  • the springs 80 are housed below in counterbores 93 of the sole 90, opening onto the upper surface 92.
  • Bores 93a opening onto the lower surface 91 and into the bottom of the counterbores 93 are provided to facilitate the machining of counterbores 93 and allow the air trapped between the lower front face 18 of the punch 10 and the upper surface 92 of sole 90 to escape during movement towards the bottom of the punch 10.
  • the springs 80 are applied at their upper end in the bottom of bores 18a open on the lower front face 18 of the punch 10, and work in compression to urge the punch 10 into upward movement, until the collar 17 stops against the bottom 13 counterbore 121, as shown in FIGS. 4A and 4B.
  • the retaining piece 120 and the sole 90 have, for the purpose of above, an identical outline of generally rectangular shape comprising, as shown in FIG. 3, on each lateral edge, two notches 130 for the passage of fasteners for the retaining piece 120 and the sole 90 on the press table, known in themselves and not shown.
  • the sole 90 and the retaining piece 120 are positioned one on the other precisely by the introduction of positioning pins 150 in respective bores 99 and 124 of the sole 90 and of the retaining part 120, axes parallel to the X axis and located in the extension of one another.
  • the retaining piece 120 comprises four counterbores 125 each arranged at in the vicinity of a corner thereof and the sole 90 has four internal threads 94 extending downwards these counterbores 125, to receive the thread of bolts 160 coming to bear axially by their head 161 in the bottom of the counterbores 125, and intended to secure the retaining piece 120 and the sole 90.
  • An extraction crown 30 is slidably mounted along the axis X on the part of the punch 10 extending outside of the retaining part 120.
  • the extraction crown 30 is delimited axially, along the X axis, by two plane front faces which are parallel to each other and perpendicular to the X axis. It is delimited radially, on the outside, by a cylindrical surface 31 of revolution around the X axis, at the base of which protrudes a flange 32, and it is delimited radially inside by a radially surface internal 33 cylindrical of revolution around the X axis, fitting closely on the cylindrical surface 11 of the punch 10.
  • the extraction crown 30 is axially retaining the punch 10 by a lower retaining ring 170 attached to the retaining part 120, and having a surface radially internal 171 shouldered, symmetrical of revolution around the X axis.
  • the extraction crown 30 is retained axially, during its displacement upwards, by abutment of the collar 32 against a shoulder 173 of the radially internal surface 171.
  • the lower retaining ring 170 has six counterbores 175 angularly distributed around the X axis, at the bottom of which come axially resting on the shoulders of bolt 180 fixing bolts, screwed in threads 126 of the retaining piece 120 extending downward the counterbores 175.
  • the lower retaining ring 170 also includes two bores 177, extended downwards by bores 128 of the workpiece retaining 120 and by bores 96 of the sole 90. Pins positioning 190 are inserted in bores 177 and 128 for precisely position the lower retaining ring 170 on the workpiece retainer 120.
  • the extraction crown 30 is capable of sliding on the punch 10 between a retracted position, in which it rests by its front face lower on the upper surface 120a of the retaining piece 120, and a extraction position of the pulley blank P.
  • the extraction crown 30 is moved axially under the action of four equally spaced 200 candles angularly around the X axis.
  • These candles 200 are suitable for being applied by their upper front face against the lower front face of the extraction crown 30, to each exert a thrust K thereon.
  • the candles 200 are mounted, at their lower end, on a device forming a spring known in itself and not shown, constituted for example by a hydraulic or pneumatic cylinder.
  • the 200 candles cross the sole 90 and retaining piece 120 with respective bores 98 and 129 of the latter, to lift the extraction crown 30 and eject the draft of the pulley P when the upper 3 and lower 2 parts of tool 1 are separated from each other, as will be explained below.
  • the punch 10 is traversed along its length by four channels 10a axes parallel to and evenly distributed around the X axis. These channels 10a open at their upper end on the upper front face 14 of the punch 10 and at their lower end in radial grooves 10b formed on the lower front face 18 of the punch 10, opening at the periphery of the latter.
  • the channels 10a and the grooves 10b allow the air trapped between the pulley blank P and the upper front face 14 of the punch 10 to evacuate when the punch 10 engages in the volume inside the blank and is applied to the flange F.
  • bores 330 with axes parallel to the X axis and equally spaced around of the latter are formed on the retaining piece 120, at a distance of the X axis chosen so that they lie radially immediately at the outside of the lower retaining ring 170. These bores 330 are each extended downwards by a bore 340 of the same diameter, crossing the sole 90. Candles 350, integral in displacement of candles 200, are able to move along the X axis in the bores 330 and 340. The 350 candles are driven in downward movement by pins 320 fixed on the upper part 3 of the tool 1, as will be specified below. The pins 320 each exert an action K 'on the candles 350 pointing down. These last on pins 320 a reaction force K directed upwards.
  • the upper part 3 of the tool 1 comprises an attached support 50 by its upper face 50a, flat and horizontal, under a movable part of the press, known in itself and not shown.
  • This matrix bottom 20 is delimited radially by a cylindrical external surface 23 of revolution around the axis X, at the upper end of which protrudes a flange 24.
  • the bottom of matrix 20 is delimited axially at its upper part by a face upper frontal 25 flat and perpendicular to the X axis.
  • the bottom of the matrix 20 is bored at its lower part along the X axis to define a housing 26, opening onto its lower front face and intended to receive the end upper 110 of the guide pin 100 when the movable part of the press, therefore the upper part 3 of the tool 1, is lowered towards the part lower 2.
  • a matrix 40 is slidably mounted along the X axis on the bottom matrix 20. It has a radially internal stepped surface, comprising a lower portion 41 and an upper portion 41a, all the two cylindrical of revolution around the axis X and delimited axially by a shoulder 42 perpendicular to the X axis.
  • the lower portion 41 fits tightly on the cylindrical surface 23 of the die bottom 20.
  • the matrix 40 has a radially outer 47 cylindrical surface of revolution around the X axis, at the upper end of which protrudes a flange 48.
  • the matrix 40 is retained axially under the support 50 by an upper retaining ring 210 attached to the lower face 51, flat and horizontal, of the support 50.
  • the upper retaining ring 210 has a surface radially internal stepped, comprising a lower portion 211 and a upper portion 212, both cylindrical of revolution around the axis X, delimited axially by a shoulder 213 perpendicular to the axis X.
  • the flange 48 of the matrix 40 is retained axially under the support 50 by the underside 51 and shoulder 213.
  • the upper retaining ring 210 has eight counterbores 216 evenly distributed around the X axis, at the bottom of which are supported the heads of bolts 250 screwed into threads 52 of support 50, extending towards the up the counterbores 216, intended to hold the upper retaining ring 210 against the underside 51 of the support 50.
  • the retaining ring upper 210 is precisely positioned under the support 50 by the engagement of two positioning pins 300 in bores 217 of the crown 210 and in the bores 53 of the support 50 surmounting them. These bores 53 are extended superiorly by threads 54 intended for the fixing, by bolting, of the support 50 under the movable part of the press.
  • the support 50 also includes, centered on the X axis, a thread 55 intended for receive a support fixing bolt 50 under the movable part of the hurry.
  • the support 50 has a generally rectangular shape, of contour identical to that of the sole 90 and the retaining piece 120, and it is provided on its two lateral edges with notches 310, located directly above the notches 130 in the lower part 2 of the tool 1, intended for passage fixing elements for the support 50 on the movable part of the press, known in themselves and not shown.
  • pins 320 are screwed, at their upper part, in internal threads 218 opening onto the lower front face of the retaining ring 210. These pins 320 are capable of engaging, when the upper part 3 of tool 1 is lowered during operation of the press, in the bores 330 and 340 of the retaining part 120 and the sole 90 to push down the candles 350, as will be specified in the following.
  • the die bottom 20 is slidably mounted along the axis X between an end position where it comes up against its upper front face 25 against the underside 51 of the support 50, as shown in the figure 1, and a start position, shown in FIG. 4A, in which the flange 24 abuts against the shoulder 42 of the matrix 40.
  • the bottom of the matrix 20 is recalled down in this end position of race by constituted return means, in the exemplary embodiment described by six springs 60, parallel to the X axis and angularly distributed around it.
  • the springs 60 are housed above in counterbores 56 of support 50 and apply at their lower end in the bottom bores 27 formed on the upper front face 25 of the die bottom 20.
  • the springs 60 work in compression and stress the bottom of the die 20 moving downwards away from the support 50.
  • the matrix 40 is slidably mounted along the X axis between a end position where it abuts by its upper front face 46 against the underside 51 of the support 50, as shown in the figure 1, and a start of travel position in which it abuts by the flange 48 against the shoulder 213 of the upper retaining ring 210.
  • the die 40 is recalled in this position at the start of the race by return means constituted in the embodiment described by eight springs 70 with axes parallel to the X axis and angularly distributed around this one. These springs 70 are engaged above in counterbores 57 of the support 50 and apply at their lower end in the bottom of bores 49 formed on the upper front face 46 of the matrix 40.
  • the springs 70 work in compression and stress the matrix 40 moving towards the low.
  • Four radial grooves are provided on the upper front face 46 of the matrix 40 and the upper front face of the retaining ring upper 210 to allow air trapped between the bottom of the die 20, the matrix 40 and the support 50 to be evacuated during the displacement of these last.
  • the axial length of the die bottom 20 is chosen so that, when the lower 2 and upper 3 parts of the tool 1 are initially apart, and that the flange 24 axially abuts against the shoulder 42 of the matrix 40 under the action of the springs 60, the plane of the annular surface 21 of the matrix bottom 20 is located under the front face lower 40a of the matrix 40.
  • the matrix 40 comes, in this initial position of the parts lower 2 and upper 3 of tool 1, abutted by the flange 48 against the shoulder 213 of the upper retaining ring 210 under the action of springs 70.
  • the upper part 3 of the tool 1 is sufficiently spaced from the lower part 2 so that the lower front face of the matrix bottom 20 is located above the upper end of the guide pin 100, and allows engagement on the latter of the pulley blank P, the free edge B of the rim J being directed downwards and coming to rest on the front face upper 30a of the extraction crown 30.
  • the punch 10 is recalled towards the top, under the action of the springs 80, until the collar 17 stops in the counterbore 121.
  • the length of the punch 10 is chosen to so that, in the initial position of tool 1, the flat surface and perpendicular to the X axis of the upper front face 14 of the punch 10 protrude slightly above the upper front surface 30a of the extraction crown 30 located directly above the annular surface 21.
  • the diameter of the surface 41 is chosen to be greater than the diameter of the surface 11 so as to provide an annular space R when the matrix 40 descended on the punch 10, as shown in FIG. 4B and as will be explained below.
  • the width of this annular space R is greater than the initial thickness e of the rim J of the pulley blank P, before operating the tool 1 and the packing of it.
  • We indicated by b the initial distance between the plane containing the free edge B of the rim J and the plane of the surface of the flange F on which connects the rim J, that is to say the plane of the surface of the flange coming to rest on the upper front face 14 of the punch 10.
  • the diameter of the lower front surface of the die bottom 20 corresponds to the diameter of the radially outer surface of the rim J so that when the die 40 is lowered on the rim J, the radially internal surface 41 of the matrix 40 covers the radially external cylindrical surface of the rim J.
  • the upper front face 14 of the punch 10 is connected to the cylindrical surface 11 by a rounded whose radius of curvature, of value r ', is less than the initial radius of curvature r of the rounding joining the radially inner cylindrical surface of the rim J and the surface of the flange F to which it is connected, before tamping.
  • the radius r ' is chosen less than or equal to 1 mm.
  • the operation of the tool 1 is as follows.
  • the part press of the press is lowered according to arrow A in FIG. 4A in direction of the press table.
  • the lower front face of the bottom of matrix 20 then comes into contact with the upper surface of the flange F.
  • the lower ends of pins 320 press ends upper 350 candles to drive them down.
  • Move candles 350 down is accompanied by the simultaneous displacement of 200 candles and therefore sliding down the crown of extraction 30 supported by the latter.
  • the pulley blank P engages then gradually on the punch 10, under the effect of the pressure exerted down through the bottom of the matrix 20, until the flange F rests on the upper front face 14 of the punch 10.
  • the continuation of the movement towards the bottom of the movable part of the press is accompanied by a depression of the bottom of the matrix 20 in the matrix 40, until the latter comes in abutment by its upper front face 25 against the lower face 51 of the support.
  • the matrix 40 covers the rim J and is applied, by its face lower frontal 40a, on the upper frontal face 30a of the crown 30.
  • the latter which ceases to be supported by candles 200 brought back down under the action of pins 320, comes into abutment by its lower front face 39 against the upper surface 120a of the workpiece retainer 120, to reach the position shown in FIG. 4B, in which the pulley blank P is firmly held between the face upper frontal 14 of the punch 10 and the annular surface 21 of the bottom of matrix 20.
  • the support 50 continues to be driven downward relative to the position shown in this figure for packing the rim J between the surface 21 of the matrix bottom 20 and the upper front face 30a of the crown extraction 30, on which the free edge of the pulley rests.
  • the punch 10 moves down the distance b - b ', as shown in Figure 4C, the new length along the X axis of the rim worth b '.
  • the settlement of the rim J is accompanied by an increase of its thickness which reaches a value e 'equal to the radial width of the annular space R.
  • the punch 10 is shown coming into abutment, at the end of tamping, by its lower front face 18 against the upper surface 92 of the sole 90.
  • the lower front face 18 of the punch 10 spares a residual play with the upper surface of the sole 90.
  • the upper part 3 of tool 1 is then raised, pins 320 stop pressing on the 350 candles which go up and 200 candles move the crown extraction 30 upwards to eject the pulley blank P from the punch 10.
  • FIGS. 5A to 5F schematically, the different stages of a process for manufacturing a grooved pulley multiple, using a tool 1 according to the invention.
  • the bell-shaped pulley blank is then leveled off on its free edge (figure 5C) to eliminate height irregularities due to stamping, then we proceed (Figure 5D) to a reversal of the bottom E of the blank to form a flange F.
  • the rim J is connected over a portion annular of the flange F extending perpendicular to the axis of symmetry of pulley. More particularly, the radially internal surface of the rim J is connected on the inside of this annular flange portion by a rounded radius of curvature r.
  • the pulley blank is then placed on tool 1 and the compacted rim J. On leaving tool 1 (FIG.
  • the rim J has a thickness e 'greater than e and constant along the axis X, the rim J connecting, on the inner side of the annular portion of the flange F, by a rounding of radius r 'less than r, r' being advantageously less than or equal to 1 mm, and on the outside of the annular portion of the flange, by A right angle.
  • This pulley has a flange F on which a hub is welded 510, for attachment to a crankshaft for example.
  • the flange may have lightening holes in a manner known per se.
  • the pulley has a rim J on the radially external surface of which a series of n grooves G 1 , ..., G n-1 , G n , n have been formed by flow-turning, in the example described being 6.
  • the extreme grooves G 1 and G n are bordered externally by annular extensions each having a recess T, surmounted by a projecting edge V.
  • This projecting edge V optional, makes it possible to avoid an axial overflow of the belt in the event of jumps of the latter.
  • Tool 1 thanks to the right angle formed between the surfaces 21 and 41 when the die 40 is lowered on the punch 10, allows to obtain, from the initial rounding by which the surface radially external of the rim J is connected to the flange F, a surface external generally at right angles to the reference W in Figure 4C.
  • This surface generally at right angles guarantees a thickness of material sufficient for the realization thereafter of the grooves by flow-turning.
  • the vibration damping device 500 consists of a ring of inertia 501 coaxial with the axis of symmetry of the pulley, bonded by its radially external surface, by means of a layer of viscoelastic material 502, for example an adhered elastomer, on the radially internal surface of a mounting ring 503.
  • the latter is forcibly inserted into the pulley and is applied against the radially internal surface of the rim J.
  • This force insertion is made possible by forming, by means of tool 1, of rim J, which makes it possible to obtain in the hollow of the groove G 1 , in N, a sufficient thickness of material (equal to 2.2 mm in the example described), so that the rim J resists this forceful insertion.
  • the invention makes it possible to produce pulleys with grooves particularly light and robust multiples, since it is possible, by example, to thicken a sheet by tamping, at the rim, without embrittlement thereof to a thickness value greater than 3 mm.
  • the invention is not limited to the shapes of pulleys shown in the drawings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Pulleys (AREA)
EP19950400617 1994-03-22 1995-03-21 Procédé de fabrication d'une poulie à gorges multiples, outil de formage mis en oeuvre par ce procédé et poulie ainsi obtenue Expired - Lifetime EP0678351B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403336 1994-03-22
FR9403336A FR2717718B1 (fr) 1994-03-22 1994-03-22 Procédé de fabrication d'une poulie à gorges multiples, outil de formage mis en Óoeuvre par ce procédé et poulie ainsi obtenue .

Publications (2)

Publication Number Publication Date
EP0678351A1 EP0678351A1 (fr) 1995-10-25
EP0678351B1 true EP0678351B1 (fr) 2000-02-16

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EP19950400617 Expired - Lifetime EP0678351B1 (fr) 1994-03-22 1995-03-21 Procédé de fabrication d'une poulie à gorges multiples, outil de formage mis en oeuvre par ce procédé et poulie ainsi obtenue

Country Status (4)

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EP (1) EP0678351B1 (es)
DE (1) DE69515075T2 (es)
ES (1) ES2143014T3 (es)
FR (1) FR2717718B1 (es)

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Publication number Priority date Publication date Assignee Title
DE102006012318B4 (de) * 2005-04-08 2014-11-13 Trumpf Werkzeugmaschinen Gmbh + Co. Kg Werkzeuge für die Blechbearbeitung sowie Bearbeitungseinheiten eines derartigen Werkzeuges
ITTO20130533A1 (it) * 2013-06-28 2014-12-29 Agla Power Transmission S P A Metodo per la realizzazione di una puleggia per applicazioni autoveicolistiche
CN105665514B (zh) * 2016-03-30 2018-07-06 奇瑞汽车股份有限公司 一种汽车顶盖加工设备
CN114192668A (zh) * 2021-11-23 2022-03-18 东风柳州汽车有限公司 一种侧围工具箱开口模具切换结构及模具

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Publication number Priority date Publication date Assignee Title
US2088265A (en) * 1932-09-08 1937-07-27 Hulin Jules Dies for the manufacture of metal wheels
GB1231177A (es) * 1967-07-14 1971-05-12
US3768295A (en) * 1972-02-08 1973-10-30 Reynolds Metals Co Forming apparatus and method
KR930007661B1 (ko) * 1989-06-28 1993-08-18 가부시끼가이샤 가네미쯔 판금제 폴리 v풀리의 제조방법
JPH051347A (ja) * 1991-06-21 1993-01-08 Furukawa Alum Co Ltd 軽量のｖ溝プーリー

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ES2143014T3 (es) 2000-05-01
FR2717718B1 (fr) 1996-06-28
EP0678351A1 (fr) 1995-10-25
FR2717718A1 (fr) 1995-09-29
DE69515075T2 (de) 2000-09-14
DE69515075D1 (de) 2000-03-23

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